JP2001176456A - Plate battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate battery with a portable wireless terminal which does not cause lowering of reliability. SOLUTION: This plate battery 1a with a battery core 21 sealed for generating power comprises a laminated film 22, in a package form containing an aluminum foil and a frame 10 encircling the laminated film 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar battery and a portable wireless terminal, and more particularly, to a planar battery used for a portable wireless terminal such as a portable telephone or a notebook personal computer, and a portable wireless device using the planar battery. It concerns the terminal.

[0002]

2. Description of the Related Art In recent years, with the spread of portable wireless terminals such as portable telephones and notebook personal computers, studies on plate batteries used for them have been advanced.

FIG. 13 is a perspective view of a conventional plate battery. Referring to FIG. 13, plate-shaped battery 200 includes laminated film 201, battery core 211, and positive electrode terminal 212.
And a negative electrode terminal 213. The laminate film 201 covers the battery core 211. Battery core 21
1 is electrically connected to the positive terminal 212 and the negative terminal 213.

[0004] The battery core 211 is formed by winding a predetermined laminate multiple times. The laminate includes a thin plate connected to the positive terminal 212, a thin plate connected to the negative terminal 213, and a separator interposed therebetween, and the thin plate is filled with an electrolyte.

A part of the positive electrode terminal 212 and a part of the negative electrode terminal 213
Is provided so as to cover a part of the laminated film 201. The laminate film 201 includes three layers of a resin layer, an aluminum foil, and a resin layer. The electrode sealing portion 201c and the sealing portion 20 are formed by pressing the ends of the laminate film 201 together.
1d and 201e are formed.

[0006] The electrode sealing portion 201c is formed by pressing the laminated films 201 positioned above and below each other to form the positive electrode terminal 2.
12 and the negative electrode terminal 213 are sandwiched and sealed. Sealing portions 201d and 201e
Are formed by laminating the laminated films 201 located above and below each other. The electrode sealing portion 201c and the sealing portions 201d and 201e can prevent the electrolyte in the battery core 211 from leaking to the outside.

The positive electrode terminal 212 and the negative electrode terminal 213 that are not covered with the laminate film 201 are electrically connected to a circuit board of a mobile phone or a notebook computer.
Thereby, power is supplied to a circuit board such as a mobile phone.

[0008]

Normally, for example, when a plate-like battery 200 is mounted on a portable telephone, the plate-like battery 20 is not used.
0 is positioned near the circuit board of the mobile phone.
Generally, a high frequency flows through the circuit board, and the high frequency is electromagnetically affected by the battery core 211, and high frequency modulation occurs. A problem arises in that the phase of the high frequency is shifted by the modulation, and the sound quality of the sound transmitted from the mobile phone is deteriorated. To prevent this modulation, the battery core 211
It is necessary to electromagnetically shield the battery core 211 by interposing a conductive material such as a metal plate between the battery core 211 and the circuit board.

In the laminated film 201, a conductive aluminum foil exists. However, in order to reduce the size and weight of mobile phones in recent years, the thickness of this aluminum foil is as thin as 0.25 mm to 0.3 mm. In such a thin aluminum foil, the battery core 21
1 cannot be sufficiently shielded electromagnetically. As a result, there is a problem that the high frequency flowing in the circuit board is modulated by the battery core 211, and the reliability of the portable wireless terminal is lowered, such as the sound quality of the mobile phone is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a plate-shaped battery which does not reduce the reliability of a portable radio terminal and a portable radio terminal using the plate-shaped battery are provided. It is intended to provide.

[0011]

A plate-shaped battery according to the present invention seals a power generating element for generating electric power, includes a first conductive film, and has a covering member formed in a wrapper-like shape. An exterior member including a second conductive film surrounding the member.

[0012] In the plate-shaped battery thus configured, the power generation element is surrounded by the envelope-shaped first conductive film and the second conductive film. That is, in this plate-shaped battery, the power generating element is surrounded by the two conductive films, and the power generating element is electromagnetically shielded by the two conductive films. Therefore, even if the circuit board of the portable wireless terminal is located around the power generation element, the power generation element does not affect the circuit board and does not modulate the high frequency flowing in the circuit board.
As a result, it is possible to provide a plate battery that does not reduce the reliability of the portable wireless terminal.

Preferably, the plate battery further includes a positive terminal and a negative terminal electrically connected to the power generating element.
The second conductive film is electrically connected to one of the positive terminal and the negative terminal.

In this case, since the second conductive film is electrically connected to one of the positive terminal and the negative terminal,
The potential of the second conductive film becomes equal to the potential of either the positive terminal or the negative terminal, and the potential of the second conductive film becomes substantially constant. Thus, the power generation element is surrounded by the second conductive film having a substantially constant potential, and can more effectively prevent the circuit board of the portable wireless terminal from being affected.

[0015] Preferably, the exterior member includes a housing.
In this case, since the exterior member also serves as a housing for positioning the plate battery, a highly reliable plate battery can be provided without increasing the number of components.

[0016] Preferably, the exterior member includes an insulating layer;
A second conductive film formed on the surface of the insulating layer.
In this case, by forming an insulating layer first and forming a second conductive film on the surface of the insulating layer, the second conductive film can be easily formed. Further, by making the insulating layer of plastic or the like, it becomes easy to manufacture the exterior member.

A portable wireless terminal according to the present invention includes any of the above-described plate batteries. Thereby, the high frequency flowing in the circuit board is not affected by the plate battery,
It is possible to provide a highly reliable portable wireless terminal that does not cause a decrease in sound quality or the like.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view including a partial cross section of a plate battery according to Embodiment 1 of the present invention. With reference to FIG. 1, the plate-shaped battery 1 a has a housing 10. The housing 10 is made of a conductive aluminum alloy having a thickness of 0.03 mm. The housing 10 has a rectangular parallelepiped shape composed of six planes. Housing windows 13 and 14 are formed on the widest surface of the rectangular parallelepiped. Housing window 13
And 14 are approximately square with a side of 4 mm. From the housing windows 13 and 14, the laminated film 22 constituting the plate-shaped battery 1a can be seen. A protrusion 15 is formed on the bottom of the housing 10. A printed circuit board 27 is mounted on the protrusion 15.

FIG. 2 is a perspective view showing the internal structure of the plate battery according to the first embodiment of the present invention. Referring to FIG. 2, plate-shaped battery 1 a includes housing 10 as an exterior member, battery core 21 as a power generation element for generating electric power, and laminate film 22 as a covering member.

The battery core 21 and the laminate film 22 are housed in the housing 10. In addition, in FIG.
Although the inside of the housing 10 is shown in a perspective view so as to be visible, the laminated film 22 and the like inside the housing 10 are only visible from the housing windows 13 and 14 of the housing 10.

A battery core 21 is positioned in the housing 10. The battery core 21 is formed by winding a predetermined laminate. Battery core 21 is electrically connected to positive electrode terminal 24a and negative electrode terminal 23a. A first sheet (current collector aluminum foil), a second sheet (current collector copper foil),
The laminate is constituted by the separator interposed between them. The current collector aluminum foil is connected to the positive electrode terminal 24a. The current collector copper foil is connected to the negative electrode terminal 23a. A metal oxide containing lithium (a positive electrode active material) is applied to the current collector aluminum foil. For the current collector copper foil,
An organic material containing lithium (a negative electrode active material) is applied.

The positive electrode terminal 24a is made of aluminum foil, has a thickness of 0.2 to 0.5 mm, and measures 7 mm × 4 mm in length × width. The negative electrode terminal 23a is made of aluminum foil and has a thickness of 0.2 to 0.5.
mm, and the dimensions are 7 mm × 4 mm in length × width.

A positive terminal 26 made of metal is fixed on the positive terminal 24a. The positive terminal 26 is
This is a member for making electrical contact with the mobile phone.
A negative electrode terminal 25 made of metal is fixed on the negative electrode terminal 23a. The negative electrode terminal 25 is a member for making electrical contact with the mobile phone.

A printed board 27 is positioned below the positive terminal 24a and the negative terminal 23b. The printed circuit board 27 is provided with a circuit that reduces the current flowing from the battery to the mobile phone when the current increases. Under the printed board 27, the printed board 2
The protrusion 15 shown in FIG.

The laminated film 22 has a sealing portion 22
d and 22e and an electrode sealing portion 22f are formed.
The sealing portion 22d is located on the battery core 21, and is formed by stacking and pressing both ends of one laminated film 22. Various methods can be considered as a method for pressing the laminated film 22.
A method of applying an adhesive between the laminated films may be used.

The sealing portion 22e is formed at the rear end of the battery 1a. The sealing portion 22e is formed by pressing the laminated films 22 positioned above and below each other. Sealing part 22e
Extends in a direction orthogonal to the direction in which the sealing portion 22d extends.

The electrode sealing portion 22f is formed by sealing the positive terminal 24a and the negative terminal 23a with two laminated films 22. The electrode sealing portion 22f is
e extends in a direction substantially parallel to the direction in which e extends and in a direction substantially perpendicular to the direction in which the sealing portion 22d extends. Sealing portions 22d and 2
2e and the electrode sealing portion 22f to form a laminate film 2
2 seals the battery core 21. Further, the laminated film 22 is formed in a wrapping shape by the sealing portions 22e and 22f and the electrode sealing portion 22d. The housing 10 is positioned so as to surround the laminate film 22.

FIG. 3 is a diagram showing a cross section viewed along the line III-III in FIG. Referring to FIG. 3, plate-shaped battery 1a has a casing 10 having a substantially rectangular cross section. Case 1
0 has an upper housing 11 and a lower housing 12 as a second conductive film. The upper housing 11 and the lower housing 12 surround the laminate film 22 and the battery core 21. The upper housing 11 and the lower housing 12 are connected to each other by welding. The lower housing 12 has a projection 15 on which the printed circuit board 27 is placed. The protrusion 15 is formed integrally with the lower housing 12, and the material thereof is the same as that of the lower housing 12. The protrusion 15 may be formed separately from the lower housing 12. The lower housing 12 supports the upper housing 11. The upper housing 11 is provided with a housing window 13 for making electrical contact with the mobile phone.

A battery core 21, a laminated film 22, a negative terminal 23a, a negative terminal 25,
A printed board 27 is provided. The laminate film 22 is composed of resin layers 22a and 22c formed of a polymer resin and an aluminum foil 22b as a first conductive film sandwiched between the resin layers 22a and 22c. The laminated film 22 can have a structure of four or more layers by adding a resin layer in addition to the three-layer structure as shown in FIG. Also, the resin layer 22a
Can be considered to form a two-layer structure. At the rear end of the plate-shaped battery 1, the laminated films 22 are pressed against each other to form a sealing portion 22e. At the front end of the plate-shaped battery 1, the laminate films 22 are pressed against each other to form an electrode sealing portion 22f for sealing the negative electrode terminal 23a and the positive electrode terminal 24a shown in FIG. Electrode sealing part 22f
Is located on the convex portion 15. The sealing portion 22e and the electrode sealing portion 22f are formed to extend from the near side to the far side of the drawing. In the vicinity of the electrode sealing portion 22f, a printed board 27 is mounted on the convex portion 15. Printed circuit board 27
A negative electrode terminal 23a is formed so as to contact with. The negative terminal 25 is formed on the negative terminal 23a. The housing window 13 is formed directly above the negative electrode terminal 25.

In the plate-shaped battery 1 configured as described above, the battery core 21 is surrounded by the aluminum foil 22b in the laminated film 22, and the battery core 21 is further surrounded by the aluminum foil 22b.
Thicker conductive upper and lower housings 11 and 12
Surrounded by Therefore, even if the circuit board of the mobile phone is located near the plate-shaped battery 1, the battery core 21 is electromagnetically shielded by the aluminum foil 22b and the housing 10, so that the high frequency of the circuit board can be modulated. Absent. As a result, a plate-shaped battery that does not reduce the reliability of a portable wireless terminal such as a portable telephone is obtained.

(Embodiment 2) FIG. 4 is a sectional view of a plate-shaped battery according to Embodiment 2 of the present invention. Referring to FIG. 4, in plate-shaped battery 1b according to the second embodiment, protrusion 1
Printed circuit board 31, terminal block 34 and negative electrode terminal 3 on
5 is different from the plate-shaped battery 1a shown in FIG. In other respects, the plate battery 1b shown in FIG. 4 has the same configuration as the plate battery 1a shown in FIG.

The printed board 13 is mounted on the projection 15. In the printed circuit board 13, a protection circuit is formed to cut off the current when the current flows from the plate-shaped battery 1b to a mobile phone or the like excessively. Wirings 32 and 33 are formed on the surface of the printed board 31. The wiring 32 is electrically connected to the negative terminal 23a. A terminal block 34 is formed on the printed board 31. A negative electrode terminal 35 made of metal is formed on the surface of the terminal block 34. The negative electrode terminal 35 contacts the electrode of the mobile phone to supply power to the mobile phone. Since the negative terminal 35 is located on the terminal block 34, the distance between the negative terminal 35 and the housing window 13 is shorter than the distance between the negative terminal 25 and the housing window 13 shown in FIG. Although not shown in FIG. 4,
In this plate battery 1b, as shown in FIG.
a. A terminal block and a positive terminal as shown in FIG. 4 are also formed at the tip of the positive terminal.

The plate battery 1b thus configured has the same effect as the plate battery described in the first embodiment.

Further, since the distance between the housing window 13 and the negative terminal 35 is reduced, it is easy to make electrical contact with the negative terminal from the outside. As a result, there is an effect that the negative electrode terminal 35 reliably contacts the terminal of the mobile phone.

(Embodiment 3) FIG. 5 is a sectional view of a plate-shaped battery according to Embodiment 3 of the present invention. Referring to FIG. 5, plate battery 1c according to Embodiment 3 of the present invention is different from plate battery 1b shown in FIG. 4 in the structure of projection 17 on lower housing 12 and negative electrode terminal 23b. .

The height of the conductive projection 17 is higher than the height of the projection 15 shown in FIG. The negative electrode terminal 23 b has a structure that is lifted up to be electrically connected to the wiring 32. The negative electrode terminal 23b and the projection 17 are not in direct contact. In order to maintain insulation between the negative electrode terminal 23b and the convex portion 17, the laminate film 22 may be extended between the negative electrode terminal 23b and the convex portion 17.

The structures of the printed board 31, the wirings 32 and 33, the terminal block 34 and the negative terminal 35 are the same as those shown in FIG. Since the convex portion 17 is higher than the convex portion 15 shown in FIG. 4, the distance between the housing window 13 and the negative electrode terminal 35 is smaller than the distance between the housing window 13 and the negative electrode terminal 35 shown in FIG. Although not shown in FIG. 5, on the back side of the paper,
A positive terminal having the same shape as the negative terminal 23b is located. Also, this positive terminal comes into contact with the printed circuit board 31,
A terminal block and a positive electrode terminal are formed at the tip.

The plate battery 1c thus configured has the same effects as the plate battery 1b described in the second embodiment. Further, since the distance between the housing window 13 and the negative electrode terminal 35 is reduced, there is an effect that the negative electrode terminal 35 more reliably contacts the terminal of the mobile phone.

(Embodiment 4) FIG. 6 is a perspective view including a partial cross section of a plate-shaped battery according to Embodiment 4 of the present invention. Referring to FIG. 6, plate-shaped battery 1 d has housing 10. The housing 10 has the same structure as the housing 10 shown in FIG.

FIG. 7 is a perspective view showing the internal structure of a plate battery according to Embodiment 4 of the present invention. Referring to FIG.
In plate-shaped battery 1d according to Embodiment 4 of the present invention, shape of positive electrode terminal 24b is different from the shape of positive electrode terminal 24a shown in FIG. That is, the positive terminal 24b shown in FIG.
The positive electrode terminal 24a is different from the positive electrode terminal 24a which does not have such a structure in that it is bent in a letter shape and its tip is electrically connected to the housing 10 by a welded portion 28. The positive electrode terminal 24b is made of the same material and has the same thickness as the positive electrode terminal 24a of FIG. 2, and is electrically connected to the battery core 21. Otherwise, the plate battery 1d shown in FIG.
Has the same structure as the plate-shaped battery 1a shown in FIG.

FIG. 8 is a view showing a cross section viewed along the line VIII-VIII in FIG. Referring to FIG. 8, a plate-shaped battery 1d has a housing 10 made of an aluminum alloy. The housing 10 includes an upper housing 11 made of an aluminum alloy and a lower housing 12 made of an aluminum alloy.

A printed board 27 is mounted on the projection 15 formed integrally with the lower housing 12. The positive electrode terminal 24b is located on the printed board 27. The positive electrode terminal 24b is in contact with the printed circuit board 27, and its tip is bent and extends in a direction away from the lower housing 12. The tip of the positive electrode terminal 24b is fixed to the upper housing 11 by a welded portion 28 and is electrically connected to the upper housing 11. Thereby, the upper housing 11 and the lower housing 12
Is the same as the potential of the positive terminal 24b and is substantially constant.

As a method of connecting the upper housing 11 and the positive electrode terminal 24b, not only welding but also connection by a lead wire or connection by soldering may be used. In addition, the positive electrode terminal 24
The upper housing 11 and the positive electrode terminal 24b may be electrically connected without fixing b to the upper housing 11. Positive terminal 24b
On the upper side, a metal positive electrode terminal 26 is fixed. The positive electrode terminal 26 is a member for making electrical contact with an electrode of the mobile phone. The housing window 14 is located on the positive electrode terminal 26.

In the plate battery 1d thus configured,
First, there is an effect similar to that of the plate-shaped battery 1a described in the first embodiment.

Further, in this plate-shaped battery, the battery core 21
The potential of the upper housing 11 and the lower housing 12 for electromagnetically shielding is the same as the potential of the positive electrode terminal 24b, and is substantially constant. Usually, the upper housing 11 and the lower housing 1
At least one of the two is capacitively coupled to the circuit board of the mobile phone. Therefore, the upper housing 11 and the lower housing 12
Fluctuates, the potential of the capacitively coupled circuit board also fluctuates, possibly modulating the high frequency flowing through the circuit board.
In the present invention, since the electric potentials of the upper housing 11 and the lower housing 12 are substantially constant, high-frequency modulation in the circuit board can be further prevented.

(Embodiment 5) FIG. 9 is a sectional view of a plate battery according to Embodiment 5 of the present invention. Referring to FIG. 9, plate battery 1e according to Embodiment 5 of the present invention is characterized in that case 19 is constituted by upper case 17 having a three-layer structure and lower case 18 having a three-layer structure. 8 is different from the plate-shaped battery 1d shown in FIG.

The upper housing 17 is composed of three layers of aluminum layers 17a and 17c and a resin layer 17b as an insulating layer. The lower housing 18 is composed of three layers of aluminum layers 18a and 18c and a resin layer 18b as an insulating layer. The resin layers 17b and 18b are formed bodies made of resin and function as a housing. Aluminum is deposited on the inner surfaces of the resin layers 17b and 18b to form a second
Aluminum layers 17c and 18c as conductive films are formed. Aluminum is deposited on the outer surfaces of the resin layers 17b and 18b to form aluminum layers 17a and 18a as second conductive films. Aluminum layer 17c is electrically connected to positive electrode terminal 24b by welding portion 28. Thus, the potentials of the aluminum layers 17c and 18c are the same as the potential of the positive terminal 24b, and are substantially constant.

The upper housing 17 and the lower housing 18 are arranged as shown in FIG.
Is not limited to a three-layer structure, as shown in FIG. 9, but a two-layer structure by removing aluminum layers 17a and 18a from the one shown in FIG. 9 or a two-layer structure by removing aluminum layers 17c and 18c. Is also good. Further, another conductive layer may be formed to have a structure of four or more layers. In addition,
To remove the aluminum layer 17c, remove the upper housing 17
It is possible to make an electrical contact between the aluminum layer 17a and the positive electrode terminal 24b through this hole.

In the structure shown in FIG.
a and 18a and aluminum layers 17a and 17c
Is not electrically connected to the aluminum layer 17
a and 18a and aluminum layers 17a and 17c
May be electrically connected.

In the plate battery 1e thus configured,
First, there is an effect similar to that of the plate battery 1d shown in FIG.
Further, since the resin layers 17b and 18b are easily processed, the housing 19 can be easily manufactured only by depositing the aluminum layers 17a, 17c, 18a and 18c on the surfaces of the resin layers 17b and 18b.

Furthermore, the aluminum layers 17a, 1
Since the layers 7c, 18a and 18c have a plurality of layers, the electromagnetic shielding of the battery core 21 is more reliable.

(Embodiment 6) FIG. 10 is a sectional view of a plate battery according to Embodiment 6 of the present invention. Referring to FIG. 10, plate battery 1 according to Embodiment 6 of the present invention
In f, the structure on the convex portion 15 is different from the plate battery 1e shown in FIG. A printed circuit board 31 is mounted on the projection 15. This printed board 31 has the same structure as the printed board 31 shown in FIG.

The printed circuit board 31 has wirings 36 and 37
Are formed. The wiring 36 is connected to the positive electrode terminal 24a and the protrusion 1
5 is electrically connected. Therefore, the potentials of the convex portion 15, the lower housing 12, and the upper housing 11 are the same as the potential of the positive terminal 24a, and are substantially constant. The wiring 34 is electrically connected to a positive terminal 39 mounted on a terminal block 38. The terminal block 38 and the positive terminal 39 are connected to the terminal block 3 shown in FIG.
4 and the same structure as the negative electrode terminal 35. Since the terminal block 38 exists, the distance between the positive terminal 39 and the housing window 14 is smaller than the distance between the positive terminal 26 and the terminal window 14 shown in FIG. The wiring 36 and the wiring 37 are electrically connected.

The plate battery 1f thus configured has the same effect as the plate battery 1d shown in the fourth embodiment. Further, since the distance between the housing window 14 and the positive electrode terminal 39 is reduced, there is an effect that the positive electrode terminal 39 reliably contacts the terminal of the mobile phone.

(Embodiment 7) FIG. 11 is a sectional view of a plate-shaped battery according to Embodiment 7 of the present invention. Referring to FIG. 11, plate battery 1 according to Embodiment 7 of the present invention
In g, the shapes of the convex portion 17 and the positive terminal 24c are different from those of the convex portion 15 and the positive terminal 24a shown in FIG. The convex portion 17 has the same shape as the convex portion 17 shown in FIG. The positive terminal 24c has the same shape as the negative terminal 23b shown in FIG. In other respects, the plate battery 1g shown in FIG. 11 has the same configuration as the plate battery 1f shown in FIG.

Since the convex portion 17 is higher than the convex portion 15,
The printed board 31, the terminal block 38, and the positive terminal 39 are positioned higher than the positions shown in FIG. Since the height of the protrusion 17 is higher than that of the protrusion 15 shown in FIG. 10, the distance between the negative electrode terminal 39 and the housing window 14 is smaller than that shown in FIG. Note that the laminate film 22 may extend between the convex portion 17 and the positive electrode terminal 24c. further,
The positive electrode terminal 24c may be placed in contact with the projection 17.

In the plate-shaped battery 1g thus configured,
First, there is an effect similar to that of the plate battery 1f of the sixth embodiment shown in FIG. Further, since the distance between the housing window 14 and the positive terminal 39 is reduced, the positive terminal 3 is connected to the terminal of the mobile phone.
9 has the effect of making contact more reliably.

(Eighth Embodiment) FIG. 12 is a sectional view of a mobile phone according to an eighth embodiment of the present invention. FIG.
, A mobile phone 100 as a mobile wireless terminal
Includes a telephone housing 101, a back housing 102, a main body substrate 103 as a circuit board of a mobile phone, and a plate-shaped battery 1a.

A main body substrate 103 is attached to a telephone case 101 and a back surface case 102. The plate-shaped battery 1a is attached to the rear housing 102. The plate-shaped battery 1a and the main body substrate 103 are electrically connected by contact pins 109. An integrated circuit for a wireless device is mounted on the main body substrate 103. Electric power is supplied to this integrated circuit from the plate battery 1a. The plate battery 1 has the same structure as the plate battery shown in FIG.

Although not shown in FIG. 12, a contact pin for contacting the positive electrode terminal of the plate-shaped battery 1a is provided on the far side of the drawing.

In the mobile phone 100 thus configured, between the battery core 21 and the main body substrate 103, there are two conductive layers of the aluminum foil 22b in the laminate film 22 and the housing 10. Since the battery core 21 is electromagnetically shielded by these two layers, the main body substrate 103
It does not modulate the high frequency flowing through it. As a result, it is possible to obtain a highly reliable mobile phone 100 without deterioration in sound quality or the like.

Although the embodiment of the present invention has been described above, the embodiment shown here can be variously modified. First, in all the embodiments, the laminated film has a three-layer structure, but is not limited to the three-layer structure, and may have a multilayer structure having more layers.

The aluminum foil 22b in the laminate film may be electrically connected to the positive electrode terminal. Further, the aluminum foil 22b may be connected to the negative electrode terminal.

Although the case where the housing and the positive terminal are electrically connected has been described, the housing and the negative terminal may be electrically connected.

The method of sealing the battery core 21 with the laminate film 22 is not limited to the method described in the present embodiment, but may be such that the sealing portion is not located on the battery core 211 as shown in FIG. It may be a thing.

Further, a recess may be provided in a part of the laminate film, the battery core may be sealed by fitting the battery core into the recess, and the housing of the present invention may be provided around the battery core.

Although a portable telephone is shown as a portable radio terminal, the plate battery of the present invention may be applied to a notebook personal computer as a portable radio terminal.

Further, the housing may be made of a conductive material such as iron, titanium, copper or the like instead of aluminum.

Further, plate batteries 1b to 1g may be mounted on portable telephone 100 shown in FIG.

Further, in the embodiment, an example in which the battery is used as a lithium battery has been described. However, the present invention is not limited to the lithium battery, and may be applied to, for example, a nickel cadmium battery. Further, the present invention can be applied to both primary batteries and secondary batteries.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0073]

According to the first to fourth aspects of the present invention, it is possible to provide a plate-shaped battery which does not reduce the reliability of the portable radio terminal.

According to the present invention, it is possible to provide a portable wireless terminal that does not cause a decrease in reliability such as a decrease in sound quality.

[Brief description of the drawings]

FIG. 1 is a perspective view including a partial cross section of a plate-shaped battery according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing an internal structure of the plate battery according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a cross section viewed along line III-III in FIG. 1;

FIG. 4 is a sectional view of a plate-shaped battery according to Embodiment 2 of the present invention.

FIG. 5 is a sectional view of a plate-shaped battery according to Embodiment 3 of the present invention.

FIG. 6 is a perspective view including a partial cross section of a plate battery according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view showing an internal structure of a plate battery according to a fourth embodiment of the present invention.

FIG. 8 is a view showing a cross section viewed along line VIII-VIII in FIG. 6;

FIG. 9 is a sectional view of a plate-shaped battery according to Embodiment 5 of the present invention.

FIG. 10 is a sectional view of a plate-shaped battery according to Embodiment 6 of the present invention.

FIG. 11 is a sectional view of a plate battery according to a seventh embodiment of the present invention.

FIG. 12 is a sectional view of a mobile phone according to an eighth embodiment of the present invention.

FIG. 13 is a perspective view of a conventional plate battery.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e, 1f, 1g Plate battery, 10, 19 housing, 11 upper housing, 12, 18
Lower housing, 15, 17 protrusion, 21 battery core, 22
Laminated film, 22b aluminum foil, 23
a, 23b, 25, 35 negative electrode terminals, 24a, 24b,
24c, 26, 39 Positive terminal.

Claims (4)

[Claims] 1. An exterior member that seals a power generation element that generates electric power, includes a first conductive film, and has a covering member formed in a wrapper shape, and a second conductive film that surrounds the covering member. A plate-shaped battery comprising: 2. The semiconductor device further comprises a positive terminal and a negative terminal electrically connected to the power generating element, and the second conductive film is electrically connected to one of the positive terminal and the negative terminal. The plate-shaped battery according to claim 1. 3. The plate-shaped battery according to claim 1, wherein the exterior member includes a housing. 4. The plate battery according to claim 1, wherein the exterior member includes an insulating layer and the second conductive film formed on a surface of the insulating layer.